Agfa Gevaert Nv

Agfa-gevaert Ag

Luc A De Brabandere

Rene M De Keyzer

Raymond L Odeurs

Herman Alberik Pattyn

Robert J Pollet

Hendrik Alfons Borginon

Anita Von Konig

Willy Joseph Vanassche

Herman Adelbert Philippaerts

Herbert Gernet

An aqueous alkaline processing liquid for use in silver halide photography, wherein said liquid comprises one or more alkanolamines, the said alkanolamines consisting of one or more tertiary alkanolamines in a total amount in the range from 0.3 mol/l to 1.5 mol/l, and one or more secondary alkanolamines in an amount from 0 mol % to 30 mol % with respect to the amount of tertiary alkanolamine(s), and said liquid also contains sulphite ions in an amount in the range of 16 g/l to 30 g/l.

Processing liquid for use in silver complex diffusion transfer processing

An aqueous alkaline processing liquid suitable for use in the silver complex diffusion transfer reversal (DTR-) process, wherein wherein said liquid contains a mixture of alkanolamines, the said mixture consisting of (I) N-methyl-diethanolamine and of (II) N,N-dimethyl-ethanolamine in a total amount in the range from 0.3 mol/l to 1.5 mol/l, and in a molar ratio of (I) to (II) from 1/20 to 20/1.

Liquid for DTR-photography

An aqueous alkaline processing liquid suitable for use in the silver complex diffusion transfer reversal (DTR-) process, wherein said liquid contains one or more alkanolamines, the said alkanolamine(s) consisting of one or more tertiary alkanolamines in an amount in the range from 0.3 mol to 1.5 mol/l, and one or more secondary alkanolamines in an amount from 0 mol % to 5 mol % with respect to the amount of tertiary alkanolamine(s), and said liquid also contains a mixture of a silver image toning agent A being 1-phenyl-1H-tetrazole-5-thiol or a tautomer thereof and at least one other silver image toning agent B being a 1-phenyl-1H-tetrazole-5-thiol or a tautomer thereof, wherein the phenyl nucleus is substituted with halogen, the toning agent A and toning agent(s) B being present in said liquid in a molar ratio from 1/15 to 15/1. 885

Processing liquid with combination of toners for silver complex

An aqueous alkaline processing liquid suitable for use in the silver complex diffusion transfer (DTR-) process, wherein said liquid contains one or more alkanolamines, the said alkanolamine(s) consisting of one or more tertiary alkanolamines in an amount in the range from 0.15 mol to 1.5 mol/l, and one or more secondary alkanolamines in an amount higher than 5 mol % but not higher than 100 mol % with respect to the amount of tertiary alkanolamine(s), and said liquid also contains a mixture of a silver image toning agent A being 1-phenyl-1H-tetrazole-5-thiol or a tautomer thereof and at least one other silver image toning agent B being a 1-phenyl-1H-tetrazole-5-thiol or a tautomer thereof, wherein the phenyl nucleus is substituted with halogen, the toning agent A and toning agent(s) B being present in said liquid in a molar ratio from 1/15 to 15/1.

Processing liquid for use in DTR-photography with two toners

Compounds of the formula ##STR1## are useful as stabilizers in photographic materials.

Photographic emulsion with stabilizer process for its preparation,

Radiographic silver halide emulsions are provided comprising silver halide grains the average silver halide grain diameter of which is at least 250 nm and which consist substantially of silver bromide dispersed in a hydrophilic colloid binder e.g. gelatin wherein the silver halide grains have high primitive surface sensitivity for direct exposure to penetrating radiation and are substantially regular in shape and wherein the ratio of hydrophilic colloid to silver halide is at most about 1.0. These emulsions have high sensitivity for direct exposure to penetrating radiation and are themselves substantially insensitive to formation of pressure marks upon rapid processing.

Rapidly processable radiographic materials

In the preparation of silver halide emulsions silver halide grain-growth is accelerated by the addition to the precipitation medium during or before silver halide precipitation of a compound of the formula ##STR1## wherein: N IS AN INTEGER FROM 1 TO 5

Preparation of photographic silver halide emulsions

Reduction and gold fogged direct-positive Lippmann-emulsions have improved gradation and higher maximum density when fogging occurs in the presence of a palladium compound.

Growing community of inventors

Lier, Belgium

Luc A De Brabandere